Protection against unsolicited communication for internet protocol multimedia subsystem

Abstract

A PUCI system is designed to process an incoming call originated by the user equipment toward the counterpart user equipment via an EMS node having a PUCI-light functionality, which includes an IBCF / I-CSCF, a S-CSCF, and a database storing the PUCI-light information. Through a query to the database indicating a suspicious session in relation to the incoming call, the IMS node immediately blocks the suspicious session or simply marks the suspicious session for the further processing at a subsequent node. The reason for rejection is included in a SIP BYE / ERROR message of an original session setup message, which is interpreted by a previous IMS node so as to obtain the relevant information from a SIP header. The relevant information is stored in either a global operator policy database or a local database, thus enabling a PUCI-negating IMS node to reject an unsolicited call related to the blocked session.

Description

[0001]The present application is the National Phase of PCT / JP2009 / 067691, filed Oct. 6, 2009, which claims priority based on Japanese Patent Application No. 2008-260090, the content of which is incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to the protection against unsolicited communications for Internet protocol multimedia subsystems.[0003]The present application claims priority based on Japanese Patent Application No. 2008-260090, the content of which is incorporated herein by reference.BACKGROUND ART[0004]Internet protocol multimedia subsystems (IMS) integrate networks such as public switched telephone networks (PSTN) and mobile communication networks so as to provide users (or subscribers) with various communication services, wherein the IMS serving as a pivotal role in the next generation network (NGN) is standardized by the third generation partnership project (3GPP).[0005]Electronic mailing services have suffered from social problems such...

AI Technical Summary

Benefits of technology

[0007]For the establishment of sessions binding operators, all operators do not necessarily have networks each enhanced in terms of the PUCI functionality for testing whether or not incoming calls are unsolicited calls. When the PUCI functionality is available only in the terminating network, other intermediate networks need to route incoming calls to the terminating network. This potentially results in a high workload of networking, since unsolicited calls or malicious calls are not detected but directly rejected by the originating network. Currently, it is impossible to detect unsolicited calls without implementing the overall PUCI functionality. The inventors seek to provide solutions as to how to benefit networks with the basic PUCI functionality by way of small changes of networking, thus demonstrating a high performance of the PUCI system.

[0008]The present invention seeks to solve the above problem by way of the following key features and effects.

[0014](6) It is possible to improve the overall performance because the PUCI-light functionality at the edge of each network relies on only the database query.

Problems solved by technology

This potentially results in a high workload of networking, since unsolicited calls or malicious calls are not detected but directly rejected by the originating network.

Currently, it is impossible to detect unsolicited calls without implementing the overall PUCI functionality.

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